from flask import abort, jsonify
from flask import current_app
from flask import g
from flask import render_template
from flask import request
from flask import session

from info import constants, db
from info.models import News, User, Comment, CommentLike
from info.modules.news import news_blu
from info.utils.common import user_login_data
from info.utils.response_code import RET


@news_blu.route('/followed_user',methods=['POST'])
@user_login_data
def followed_user():
    """
    关注或者取消关注用户
    :return:
    """
    # 取到自己的登录信息
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg='未登录')

    # 1.获取参数
    user_id = request.json.get('user_id')
    action = request.json.get('action')
    # 2.判断参数
    if not all([user_id,action]):
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')
    if action not in('follow','unfollow'):
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')
    # 3.取到要被关注的用户
    try:
        other = User.query.get(user_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='数据查询失败')
    if not other:
        return jsonify(errno=RET.NODATA, errmsg='未查询的到数据')
    # 根据操作
    if action == 'follow':
        if other not in user.followed:
            # 当前用户的关注列表添加一个值
            user.followed.append(other)
        else:
            return jsonify(errno=RET.DATAEXIST, errmsg='当前用户已被关注')
    else:
        # 取消关注
        if other in user.followed:
            user.followed.remove(other)
        else:
            return jsonify(errno=RET.DATAEXIST, errmsg='当前用户未被关注')

    return jsonify(errno=RET.OK, errmsg='操作成功')


@news_blu.route('/comment_like', methods=['POST'])
@user_login_data
def comment_like():
    """
    评论点赞
    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg='用户未登录')

    # 1. 取到参数
    comment_id = request.json.get('comment_id')
    news_id = request.json.get('news_id')
    action = request.json.get('action')

    if not all([comment_id, news_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')
    if action not in ["add","remove"]:
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')
    try:
        comment_id = int(comment_id)
        news_id = int(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')
    try:
        comment = Comment.query.get(comment_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='数据查询失败')
    if not comment:
        return jsonify(errno=RET.NODATA, errmsg='评论不存在')
    if action == 'add':
        comment_like_model = CommentLike.query.filter(CommentLike.user_id==user.id,CommentLike.comment_id==comment.id).first()
        if not comment_like_model:
            # 点赞评论
            comment_like_model = CommentLike()
            comment_like_model.user_id = user.id
            comment_like_model.comment_id = comment.id
            db.session.add(comment_like_model)
            comment.like_count += 1
    else:
        # 取消点赞评论
        comment_like_model = CommentLike.query.filter(CommentLike.user_id==user.id,CommentLike.comment_id==comment.id).first()
        if comment_like_model:
            # comment_like_model.delete()
            db.session.delete(comment_like_model)
            comment.like_count -= 1
    try:
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()
        return jsonify(errno=RET.DBERR, errmsg='数据库操作失败')

    return jsonify(errno=RET.OK, errmsg='OK')


@news_blu.route('/news_comment', methods=['POST'])
@user_login_data
def comment_news():
    """
    评论信息或者回复某条新闻下指定的评论
    :return:
    """

    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg='用户未登录')
    # 1. 取到参数
    news_id = request.json.get('news_id')
    comment_content = request.json.get('comment')
    parent_id = request.json.get('parent_id')
    # 2.判断参数
    if not all([news_id, comment_content]):
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')

    try:
        news_id = int(news_id)
        if parent_id:
            parent_id = int(parent_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')
    # ３．查询新闻，并判断新闻是否存在
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='数据查询错误')
    if not news:
        return jsonify(errno=RET.NODATA, errmsg='未查询到新闻数据')

    # 3.初始化评论模型并赋值
    comment = Comment()
    comment.user_id = user.id
    comment.news_id = news_id
    comment.content = comment_content
    if parent_id:
        comment.parent_id = parent_id

    # 4.添加到数据库
    # 因为在return的时候需要用到comment的id，所以自己commit
    try:
        db.session.add(comment)
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()

    return jsonify(errno=RET.OK, errmsg='OK', data=comment.to_dict())



@news_blu.route('/news_collect',methods=['POST'])
@user_login_data
def collect_news():
    """
    收藏新闻
    １．接受参数
    ２．判断参数
    ３．查询新闻，并判断新闻是否存在
    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg='用户未登录')
    # 1.接受参数
    news_id = request.json.get('news_id')
    action = request.json.get('action')

    # 2.判断参数
    if not all([news_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')
    if action not in ['collect','cancel_collect']:
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')

    try:
        news_id = int(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')
    # ３．查询新闻，并判断新闻是否存在
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='数据查询错误')
    if not news:
        return jsonify(errno=RET.NODATA, errmsg='未查询到新闻数据')

    if action == 'cancel_collect':
        # 取消收藏
        if news in user.collection_news:
            user.collection_news.remove(news)
    else:
        # 收藏
        if news not in user.collection_news:
            # 添加到用户收藏列表
            user.collection_news.append(news)

    return jsonify(errno=RET.OK, errmsg='收藏成功')


@news_blu.route("/<int:news_id>")
@user_login_data
def news_detail(news_id):
    """
    新闻详情
    :param news_id:
    :return:
    """
    # 显示用户是否登录的逻辑
    user = g.user

    # 右侧的新闻排行的逻辑
    news_list = []
    try:
        news_list = News.query.order_by(News.clicks.desc()).limit(constants.CLICK_RANK_MAX_NEWS)
    except Exception as e:
        current_app.logger.error(e)
    # 定义一个空的字典列表
    news_dict_li = []
    # 遍历对象列表，将对象的字典添加到字典列表中国
    for news in news_list:
        news_dict_li.append(news.to_basic_dict())

    # 查询新闻数据
    news = None
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
    if not news:
        # 报404错误，　404页面统一显示
        abort(404)

    # 更新新闻的点击次数
    news.clicks += 1

    is_collected = False
    if user:
        # 判断用户是否收藏
        # collection_news后面可以不用加all()，因为sqlalchemy会在使用的时候自动加载
        if news in user.collection_news:
            is_collected = True

    # 查询评论数据
    comments =[]
    try:
        comments = Comment.query.filter(Comment.news_id == news_id).order_by(Comment.create_time.desc()).all()
    except Exception as e:
        current_app.logger.error(e)

    comment_like_ids =[]
    if g.user:
        try:
            # 需求：查询当前用户在当前新闻里面都点赞了哪些评论
            # 1.查询出当前新闻的所有评论([COMMENT])　取到所有的评论id
            comment_ids = [comment.id for comment in comments]
            # 2.查询当前评论中哪些评论被当前用户点赞([CommentLike])　查询comment_id在第一步评论id列表内人所有数据
            comment_likes = CommentLike.query.filter(CommentLike.comment_id.in_(comment_ids),CommentLike.user_id == g.user.id).all()
            # 3.取到所有被点赞的评论id，第2步查询处理的是一个【CommentLike】 ——> [3,5]
            comment_like_ids = [comment_like.comment_id for comment_like in comment_likes]
        except Exception as e:
            current_app.logger.error(e)

    comment_dict_li = []
    for comment in comments:
        comment_dict = comment.to_dict()
        # 默认没有点赞
        comment_dict['is_like'] = False
        # 判断当前遍历到的评论是否被当前登录用户所点赞
        if comment.id in comment_like_ids:
            comment_dict['is_like'] = True
        comment_dict_li.append(comment_dict)

    is_followed = False
    # 如果当前新闻有作者，并且当前用户已关注过这个用户
    if news.user and user:
        if news.user in user.followed:
            is_followed = True

    data = {
        "user": user.to_dict() if user else None,
        "news_dict_li": news_dict_li,
        "news":news.to_dict(),
        "is_collected":is_collected,
        "comments":comment_dict_li,
        "is_followed":is_followed
    }
    return render_template('news/detail.html', data=data)